1111231213 has 4 divisors (see below), whose sum is σ = 1111319548. Its totient is φ = 1111142880.

The previous prime is 1111231201. The next prime is 1111231229. The reversal of 1111231213 is 3121321111.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1034458569 + 76772644 = 32163^2 + 8762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1111231213 - 2⁵ = 1111231181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111231013) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21378 + ... + 51763.

It is an arithmetic number, because the mean of its divisors is an integer number (277829887).

Almost surely, 2^1111231213 is an apocalyptic number.

It is an amenable number.

1111231213 is a deficient number, since it is larger than the sum of its proper divisors (88335).

1111231213 is an equidigital number, since it uses as much as digits as its factorization.

1111231213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88334.

The product of its digits is 36, while the sum is 16.

The square root of 1111231213 is about 33335.1348129867. The cubic root of 1111231213 is about 1035.7814857561.

Adding to 1111231213 its reverse (3121321111), we get a palindrome (4232552324).

It can be divided in two parts, 1111 and 231213, that added together give a square (232324 = 482²).

The spelling of 1111231213 in words is "one billion, one hundred eleven million, two hundred thirty-one thousand, two hundred thirteen".